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post.scala

val f1: Future[Int] = Future { Thread.sleep(100); 1 }
  val f2: Future[Int] = Future { Thread.sleep(1000); 2 }
  val f3: Future[Int] = Future { Thread.sleep(100); 1 }
  val f4: Future[Int] = Future { Thread.sleep(1000); 2 }

  import com.thoughtworks.each.Monadic._
  import scalaz.std.scalaFuture._
  
  val sum = monadic[Future] {
    f1.each + f2.each + f3.each + f4.each
  }
  sum.onSuccess { case s => println(s"Example 1: $s") }
  // prints 6 after one second